MXPickerView 是一个对 UIPickerView 和 UIDatePicker的封装, 三行代码实现`年月日`的弹出控件

代码demo已在Github开源, MXPickerView 如果能帮助到您，可以点个星star哈，谢谢！

MXPickerView 是一个对 UIPickerView 和 UIDatePicker的封装, 三行代码实现年月日的弹出控件

屏幕截图

MXPickerViewModeCustom	MXPickerViewModeDD	MXPickerViewModeDD_DD	MXPickerViewModeMM
MXPickerViewModeCustom	MXPickerViewModeDD	MXPickerViewModeDD_DD	MXPickerViewModeMM
MXPickerViewModeMM_MM	MXPickerViewModeMM_DD	MXPickerViewModeMMDD_MMDD	MXPickerViewModeYYYY
MXPickerViewModeMM_MM	MXPickerViewModeMM_DD	MXPickerViewModeMMDD_MMDD	MXPickerViewModeYYYY
MXPickerViewModeYYYY_YYYY	MXPickerViewModeYYYY_MM	MXPickerViewModeYYYYMM_YYYYMM	MXPickerViewModeYYYYMMDD_YYYYMMDD
MXPickerViewModeYYYY_YYYY	MXPickerViewModeYYYY_MM	MXPickerViewModeYYYYMM_YYYYMM	MXPickerViewModeYYYYMMDD_YYYYMMDD
MXPickerViewModeTime	MXPickerViewModeDate	MXPickerViewModeDateAndTime	MXPickerViewModeCountDownTimer
MXPickerViewModeTime	MXPickerViewModeDate	MXPickerViewModeDateAndTime	MXPickerViewModeCountDownTimer

可自定义属性

ScreenshotsInDemoxxxxxxxxxx	Attribute Name	Example
image	NSDictionary *barBtnItemTitleTextAttributes;	pickerView.barBtnItemTitleTextAttributes = @{NSFontAttributeName: [UIFont boldSystemFontOfSize:14], NSForegroundColorAttributeName: [UIColor redColor]}
image	NSString yearLocale, monthLocale, *dayLocale;	pickerView.yearLocale = @"年"; pickerView.monthLocale = @"月"; pickerView.dayLocale = @"号";
image	BOOL toolBarPositionBottom; //默认为`NO`,`返回`和`确定`按钮显示在顶部，当设为`YES`,`返回`和`确定`按钮显示在底部	pickerView.toolBarPositionBottom = YES;
image	NSArray *topTipBarTitles; //不为`nil`时, `toolBarPositionBottom` 会自动设置为`YES`，底部显示`返回`和`确定`按钮，顶部显示`topTipBarTitles`, 如`开始日期 - 结束日期`	pickerView.topTipBarTitles = @[@"开始日期", @"结束日期"];
image	CGFloat topTipBarH, toolBarH; pickerView.topTipBarH = 50; pickerView.toolBarH = 30; // 底部显示`返回`和`确定`按钮，顶部显示`开始日期 - 结束日期` `topTipBarTitles`一栏高度，默认是44; `返回`和`确定`按钮一栏高度，默认是44	pickerView.topTipBarTitles = @[@"开始日期", @"结束日期"];
image	BOOL showsDescending; // 默认升序,结果为12, 1, 2, 3... 11, 12，当为降序，结果为12, 11, 10, ...4, 3, 2, 1, 12, 仅支持`mode`是日期类的，如`MXPickerViewModeDD`...	pickerView.showsDescending = YES;
image	id selectedTitleOrCustomModels; //如果值不为空，则`pickerView`会把当前值选中， demo中是把上一个值记录为`selectedTitleOrCustomModels`，当模式为`MXPickerViewModeCustom`, `selectedTitleOrCustomModels` 应该为`customModels`, 是一个 `NSArray`数组类型, 如 `@[@"0-1", @"1-2", @"2-3"]` 当模式为日期一类的，如`MXPickerViewModeDD`..., `selectedTitleOrCustomModels`应该为`selectedTitle`, 是一个用空格拼接的`NSString`数组类型, 格式类似于`2018 12 12` 当模式为`UIDatePicker`一类的, 如`MXPickerViewModeDateAndTime`, `selectedTitleOrCustomModels` 不应该传, 默认值总是nil!	//当模式为`MXPickerViewModeCustom` pickerView.selectedTitleOrCustomModels = @[@"0-1", @"1-2", @"2-3"]; //当模式为日期一类的，如`MXPickerViewModeDD`..., pickerView.selectedTitleOrCustomModels = @"12月 1号"
image	NSDate minimumDate; NSDate maximumDate; //仅支持`mode`是日期类的，如`MXPickerViewModeDD`...	//创建从（今天 - 今天 + 10天），如（1号 - 10号）的列表 //方式1，设置`中间的时间间隔`，超过当月的`最大天数`, 代码内部会取余`deltaBetweenMaxAndMin%最大天数`，推荐方式一 pickerView.minimumDate = [NSDate date]; pickerView.deltaBetweenMaxAndMin = 10; //方式二, 设置`最小日期`和`最大日期`，超过当月的`最大天数`,代码内部会取余 `deltaBetweenMaxAndMin%最大天数` pickerView.minimumDate = [NSDate date]; pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 24 * 60 * 60 sinceDate:pickerView.minimumDate];
image	CGFloat componentWidth; //设置每个`component`的宽度，等宽，如果不设置，默认为`pickerView.bounds.size.width/numberOfComponents`	pickerView.componentWidth = 100; //每一列`component`列宽都为`100`
image	CGFloat componentRowHeight; //设置每个`component`的行高，如果不设置，默认为`40`	pickerView.componentRowHeight = 100;
image	`CGFloat (^configPickerViewWidthForComponentBlock)(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger component)` //为每个`component`设置不同的宽度,相同的可以直接设置`pickerView.componentWidth = xx`	```pickerView.configPickerViewWidthForComponentBlock = ^CGFloat(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger component) { return (component == 0	component == 3) ? 80 : (mxPickerView.bounds.size.width - 2 * 80)/4;};```
image	`CGFloat(^configPickerViewRowHeightForComponentBlock)(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger component)` //为每个`component`设置相同的行高, 等价于`pickerView.componentRowHeight = xx`	`pickerView.configPickerViewRowHeightForComponentBlock = ^CGFloat(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger component) {return 100;};`
image	`NSString * (^configPickerViewTitleForRowForComponentBlock)(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger row, NSInteger component);` //设置每一行的`title`	`pickerView.configPickerViewTitleForRowForComponentBlock = ^NSString (MXPickerView mxPickerView, UIPickerView *pickerView, NSInteger row, NSInteger component) {return @"row content";};`
image	`NSAttributedString * (^configPickerViewAttributedTitleForRowForComponentBlock)(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger row, NSInteger component)` //设置每一行的`attributedTitle`	`pickerView.configPickerViewAttributedTitleForRowForComponentBlock = ^NSAttributedString (MXPickerView mxPickerView, UIPickerView *pickerView, NSInteger row, NSInteger component) {return [[NSAttributedString alloc] initWithString:@"attributed title" attributes:@{NSForegroundColorAttributeName:[UIColor purpleColor]}];};`
image	`void (^configPickerViewContentLabelAppearanceForRowForComponentBlock)(MXPickerView mxPickerView, UIPickerView pickerView, UILabel *contentLabel, NSInteger row, NSInteger component);` //设置 content label 的样式，如字体，文字对齐方式，背景颜色等...	`pickerView.configPickerViewContentLabelAppearanceForRowForComponentBlock = ^(MXPickerView mxPickerView, UIPickerView pickerView, UILabel *contentLabel, NSInteger row, NSInteger component){ contentLabel.backgroundColor = [UIColor yellowColor];//黄色 contentLabel.textAlignment = NSTextAlignmentRight;};//右对齐`
image	`UIView * (^configPickerViewViewForRowForComponentBlock)(MXPickerView mxPickerView, UIPickerView pickerView, NSInteger row, NSInteger component, UIView *reusingView);` //自定义在`component`中的`contentView`	`pickerView.configPickerViewViewForRowForComponentBlock = ^UIView (MXPickerView mxPickerView, UIPickerView pickerView, NSInteger row, NSInteger component, UIView reusingView) {return [UIButton buttonWithType:UIButtonTypeContactAdd];//返回UIButtonTypeContactAdd};`

如何使用

MXPickerViewModeCustom

    [MXPickerView showWithSize:CGSizeMake(self.view.bounds.size.width, 200) pickerViewMode:MXPickerViewModeCustom updateBlock:^(MXPickerView *pickerView, MXPickerViewMode pickerViewMode, id uiDatePickerOrUIPickerView) {
        // 设置`contentlLabel`文字
        pickerView.modelsM = (id)@[@[@"0-0", @"0-1", @"0-2", @"0-3"], @[@"1-0", @"1-1", @"1-2", @"1-3"], @[@"2-0", @"2-1", @"2-2", @"2-3"]];
        //pickerView.selectedTitleOrCustomModels = @[@"0-1", @"1-2", @"2-3"];
        pickerView.selectedTitleOrCustomModels = (NSArray *)self.selectedTitleOrCustomModelsDictM[@(pickerViewMode)];
        pickerView.configPickerViewTitleForRowForComponentBlock = ^NSString *(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger row, NSInteger component) {
            return [NSString stringWithFormat:@"%@", mxPickerView.modelsM[component][row]];
        };
        //pickerView.barBtnItemTitleTextAttributes = @{NSFontAttributeName: [UIFont boldSystemFontOfSize:14], NSForegroundColorAttributeName: [UIColor redColor]};
        pickerView.doneButtonDidClickBlock = ^(MXPickerViewMode pickerViewMode, CGFloat countDownDuration, NSDate *date, id selectedTitleOrCustomModels) {
            NSLog(@"selectedTitleOrCustomModels: %@", selectedTitleOrCustomModels);
            self.selectedTitleOrCustomModelsDictM[@(pickerViewMode)] = (NSArray *)selectedTitleOrCustomModels;
        };
        /*// 设置`contentlLabel`属性字符串，打开注释
         pickerView.configPickerViewAttributedTitleForRowForComponentBlock = ^NSAttributedString *(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger row, NSInteger component) {
            return [[NSAttributedString alloc] initWithString:@"attributed title" attributes:@{NSForegroundColorAttributeName:[UIColor purpleColor]}];
        };*/
        /*// 需要为不同`component`返回不一样列高时，打开注释
         pickerView.configPickerViewWidthForComponentBlock = ^CGFloat(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger component) {
             return (component == 0 || component == 3) ? 70 : (self.view.bounds.size.width - 2 * 80)/4;
         };*/
        /*// 为每个`component`设置不同的行高, 相同的可以直接设置`pickerView.componentRowHeight = xx`
         pickerView.configPickerViewRowHeightForComponentBlock = ^CGFloat(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger component) {
             return 100;
         };*/
        //pickerView.componentRowHeight = 100; //默认每一列`component`行高都为40,当所有的`component`行高相等时，可统一设置, 相当于`tableView.rowHeight`
        //pickerView.toolBarPositionBottom = YES; //默认为`NO`,`返回`和`确定`按钮显示在顶部，当设为`YES`,`返回`和`确定`按钮显示在底部
        //pickerView.topTipBarTitles = @[@"开始日期", @"结束日期"]; //不为`nil`时,`toolBarPositionBottom`会自动设置为`YES`，底部显示`返回`和`确定`按钮，顶部显示`开始日期 - 结束日期`
        //pickerView.topTipBarH = 50; //`topTipBarTitles`一栏高度，默认是44
        //pickerView.toolBarH = 30; //`返回`和`确定`按钮一栏高度，默认是44
        //pickerView.backgroundColor = [UIColor lightGrayColor];
        /*//自定义在`component`中的`contentView`
         pickerView.configPickerViewViewForRowForComponentBlock = ^UIView *(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger row, NSInteger component, UIView *reusingView) {
             return [UIButton buttonWithType:UIButtonTypeContactAdd];
        };*/
        // 想设置`contentLabel`的各个属性，实现`appearance block`
        pickerView.configPickerViewContentLabelAppearanceForRowForComponentBlock = ^(MXPickerView *mxPickerView, UIPickerView *pickerView, UILabel *contentLabel, NSInteger row, NSInteger component) {
            contentLabel.backgroundColor = [UIColor yellowColor];
            contentLabel.textAlignment = NSTextAlignmentRight;
         };
        /*pickerView.datePickerDidChangeBlock = ^(MXPickerViewMode pickerViewMode, CGFloat countDownDuration, NSDate *date, NSString *selectedTitle) {
            NSLog(@"pickerViewMode\n: %ld, countDownDuration\n: %f, date\n: %@, selectedTitle\n: %@", pickerViewMode, countDownDuration, date, selectedTitle);
        };*/
    }];

其他 date Mode

MXPickerViewModeDD，
MXPickerViewModeDD_DD
MXPickerViewModeMM
MXPickerViewModeMM_MM
MXPickerViewModeMM_DD
MXPickerViewModeMMDD_MMDD
MXPickerViewModeYYYY
MXPickerViewModeYYYY_YYYY
MXPickerViewModeYYYY_MM
MXPickerViewModeYYYYMM_YYYYMM
MXPickerViewModeYYYYMMDD_YYYYMMDD

[MXPickerView showWithSize:CGSizeMake(self.view.bounds.size.width, 200) pickerViewMode:mode updateBlock:^(MXPickerView *pickerView, MXPickerViewMode pickerViewMode, id uiDatePickerOrUIPickerView) {
        switch (mode) {
            case MXPickerViewModeDD:
            case MXPickerViewModeDD_DD: {
                //创建从（今天 - 今天 + 10天），如（1号 - 10号）的列表，方式1和方式2结果一样
                //方式1，设置中间的时间间隔，超过当月的`最大天数`,代码内部会取余`deltaBetweenMaxAndMin%最大天数`，推荐方式一，方式二需要算日期，麻烦
                pickerView.minimumDate = [NSDate date];
                pickerView.deltaBetweenMaxAndMin = 10;
                /*
                 //方式2, 设置`最小日期`和`最大日期`，超过当月的`最大天数`,代码内部会取余`deltaBetweenMaxAndMin%最大天数`
                 pickerView.minimumDate = [NSDate date];
                 pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 24 * 60 * 60 sinceDate:pickerView.minimumDate];
                 */
                //方式3，什么都不写，全部使用默认值，1号 - 当月最大天数，`pickerView.deltaBetweenMaxAndMin = 当月最大天数`;//会根据当前模式设置默认值,`MXPickerViewModeDD_DD`会自动算当月最大几号，以及闰年
                //
                break;
            }
            case MXPickerViewModeMM:
            case MXPickerViewModeMM_MM: {
                //创建从（今月 - 今月 + 10月），如（1月 - 10月）的列表，方式1和方式2结果一样，推荐方式一，方式二需要算日期，麻烦
                //方式1，设置`最小日期`和`中间的时间间隔`，超过12,代码内部会取余`deltaBetweenMaxAndMin%12`
                pickerView.minimumDate = [NSDate date];
                pickerView.deltaBetweenMaxAndMin = 10;
                /*
                 //方式2, 设置`最小日期`和`最大日期`，超过12代码内部会取余`deltaBetweenMaxAndMin%12`
                 pickerView.minimumDate = [NSDate date];
                 pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 60 * 60 sinceDate:pickerView.minimumDate];
                 */
                //方式3，什么都不写，全部使用默认值 1月 - 12月，`pickerView.deltaBetweenMaxAndMin = 12`;//会根据当前模式设置默认值,`MXPickerViewModeMM_MM`则为12
                break;
            }
            case MXPickerViewModeMM_DD: // 1月1号
            case MXPickerViewModeMMDD_MMDD: {
                //创建从（今月1号 -（今月 + 10）31号）的列表，如（1月1号 - 10月31号），方式1和方式2结果一样，推荐方式一，方式二需要算日期，麻烦
                //方式1，设置中间的时间间隔，超过12,代码内部会取余`deltaBetweenMaxAndMin%12`
                pickerView.minimumDate = [NSDate date];
                pickerView.deltaBetweenMaxAndMin = 10;
                ///*
                 //方式2, 设置`最小日期`和`最大日期`，超过12，代码内部会取余`deltaBetweenMaxAndMin%12`
                //pickerView.minimumDate = [NSDate date];
                //pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 30 * 24 * 60 * 60 sinceDate:pickerView.minimumDate];
                 //*/
                //方式3，什么都不写，全部使用默认值，1月1号 - 12月31号，`pickerView.deltaBetweenMaxAndMin = 12`;//会根据当前模式为`MXPickerViewModeDD_DD`设置默认值12，会自动算当月最大几号，以及闰年
                break;
            }
            case MXPickerViewModeYYYY:
            case MXPickerViewModeYYYY_YYYY: {
                //创建从（今年 -（今年 + 10）的列表，如（2018年 - 2028年），方式1和方式2结果一样，推荐方式一，方式二需要算日期，麻烦
                //方式1，设置中间的时间间隔，超过12,代码内部会取余`deltaBetweenMaxAndMin%12`
                pickerView.minimumDate = [NSDate date];
                pickerView.deltaBetweenMaxAndMin = 10;
                ///*
                //方式2, 设置最大的日期
                //pickerView.minimumDate = [NSDate date];
                //pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 12 * 30 * 24 * 60 * 60 sinceDate:pickerView.minimumDate];
                //*/
                //方式3，什么都不写，全部使用默认值，1918年 - 今年，`pickerView.deltaBetweenMaxAndMin = 100`;//会根据当前模式为`MXPickerViewModeYYYY_YYYY`设置默认值100
                break;
            }
            case MXPickerViewModeYYYY_MM: // 2018年1月
            case MXPickerViewModeYYYYMM_YYYYMM: {
                //创建从（今年1月 -（今年 + 10）12月）的列表，如（2018年1月 - 2028年12月），方式1和方式2结果一样，推荐方式一，方式二需要算日期，麻烦
                //方式1，设置中间的时间间隔，超过12,代码内部会取余`deltaBetweenMaxAndMin%12`
                pickerView.minimumDate = [NSDate date];
                pickerView.deltaBetweenMaxAndMin = 10;
                ///*
                //方式2, 设置最大的日期
                //pickerView.minimumDate = [NSDate date];
                //pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 12 * 30 * 24 * 60 * 60 sinceDate:pickerView.minimumDate];
                //*/
                //方式3，什么都不写，全部使用默认值，1918年1月 - 今年12月，`pickerView.deltaBetweenMaxAndMin = 100`;//会根据当前模式为`MXPickerViewModeYYYY_YYYY`设置默认值100
                break;
            }
            case MXPickerViewModeYYYYMMDD_YYYYMMDD: {
                //pickerView.componentWidth = 70;//6列需要在block中单独设置每一列的宽度，要不然2018显示20..
                //创建从（今年1月1号 -（今年 + 10）12月31号）的列表，如（2018年1月1号 - 2028年12月31号），方式1和方式2结果一样，推荐方式一，方式二需要算日期，麻烦
                //方式1，设置中间的时间间隔，超过12,代码内部会取余`deltaBetweenMaxAndMin%12`
                pickerView.minimumDate = [NSDate date];
                pickerView.deltaBetweenMaxAndMin = 10;
                ///*
                //方式2, 设置最大的日期
                //pickerView.minimumDate = [NSDate date];
                //pickerView.maximumDate = [NSDate dateWithTimeInterval:10 * 12 * 30 * 24 * 60 * 60 sinceDate:pickerView.minimumDate];
                //*/
                //方式3，什么都不写，全部使用默认值，1918年1月1号 - 今年12月31号，`pickerView.deltaBetweenMaxAndMin = 100`;//会根据当前模式为`MXPickerViewModeYYYY_YYYY`设置默认值100
                break;
            }
            default:
                break;
        }
        //pickerView.showsDescending = YES;//默认升序,结果为12, 1, 2, 3... 11, 12，当为降序，12, 11, 10,...4, 3, 2, 1, 12
        
        //pickerView.componentRowHeight = 100; //默认每一列`component`行高都为40,当所有的`component`行高相等时，可统一设置, 相当于`tableView.rowHeight`
        //需要为不同`component`返回不一样行高时，打开注释
        /*pickerView.configPickerViewRowHeightForComponentBlock = ^CGFloat(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger component) {
            return 100;
        };*/
        
        //pickerView.componentWidth = 100; //默认每一列`component`列宽都为`pickerView.bounds.size.width/numberOfComponents`,当所有的`component`行高相等时，可统一设置
        //需要为不同`component`返回不一样列宽时，打开注释
        if (mode == MXPickerViewModeYYYYMMDD_YYYYMMDD) {
            pickerView.configPickerViewWidthForComponentBlock = ^CGFloat(MXPickerView *mxPickerView, UIPickerView *pickerView, NSInteger component) {
                return (component == 0 || component == 3) ? 60 : (mxPickerView.bounds.size.width - 2 * 60 - 15)/4;
            };
        }

        //pickerView.toolBarPositionBottom = YES; //默认为`NO`,`返回`和`确定`按钮显示在顶部，当设为`YES`,`返回`和`确定`按钮显示在底部
        //pickerView.topTipBarTitles = @[@"开始日期", @"结束日期"]; //不为`nil`时,`toolBarPositionBottom`会自动设置为`YES`，底部显示`返回`和`确定`按钮，顶部显示`开始日期 - 结束日期`
        //pickerView.topTipBarH = 50; //`topTipBarTitles`一栏高度，默认是44
        //pickerView.toolBarH = 30; //`返回`和`确定`按钮一栏高度，默认是44
        //pickerView.backgroundColor = [UIColor lightGrayColor];
        /*
         // 想设置`contentLabel`的各个属性，实现`appearance block`
         pickerView.configPickerViewContentLabelAppearanceForRowForComponentBlock = ^(MXPickerView *mxPickerView, UIPickerView *pickerView, UILabel *contentLabel, NSInteger row, NSInteger component) {
             contentLabel.backgroundColor = [UIColor yellowColor];
             contentLabel.textAlignment = NSTextAlignmentRight;
         };*/
        pickerView.yearLocale = @"年";
        pickerView.monthLocale = @"月";
        pickerView.dayLocale = @"号";
        pickerView.selectedTitleOrCustomModels = (NSString *)self.selectedTitleOrCustomModelsDictM[@(mode)];;
        pickerView.doneButtonDidClickBlock = ^(MXPickerViewMode pickerViewMode, CGFloat countDownDuration, NSDate *date, id selectedTitleOrCustomModels) {
            NSLog(@"selectedTitleOrCustomModels: %@", selectedTitleOrCustomModels);
            self.selectedTitleOrCustomModelsDictM[@(pickerViewMode)] = (NSString *)selectedTitleOrCustomModels;
        };
    }];

Date and time

MXPickerViewModeTime
MXPickerViewModeDate
MXPickerViewModeDateAndTime
MXPickerViewModeCountDownTimer

    [MXPickerView showWithSize:CGSizeMake(self.view.bounds.size.width, 200) pickerViewMode:mode updateBlock:^(MXPickerView *pickerView, MXPickerViewMode pickerViewMode, id uiDatePickerOrUIPickerView) {
        UIDatePicker *datePicker = (UIDatePicker *)uiDatePickerOrUIPickerView;
        datePicker.minuteInterval = 1;
        switch (mode) {
            case MXPickerViewModeTime: {
                //前1小时 - 后1小时
                datePicker.date = [NSDate date];
                datePicker.minimumDate = [NSDate dateWithTimeInterval:-1 * 60 * 60 sinceDate:datePicker.date];
                datePicker.maximumDate = [NSDate dateWithTimeInterval:1 * 60 * 60 sinceDate:datePicker.date];
                break;
            }
            case MXPickerViewModeDate:
            case MXPickerViewModeDateAndTime: {
                //前天 - 后天
                datePicker.date = [NSDate date];
                datePicker.minimumDate = [NSDate dateWithTimeInterval:-24 * 60 * 60 sinceDate:datePicker.date];
                datePicker.maximumDate = [NSDate dateWithTimeInterval:24 * 60 * 60 sinceDate:datePicker.date];
                break;
            }
            case MXPickerViewModeCountDownTimer: {
                datePicker.countDownDuration = 60 * 10;//选中为10分钟
                break;
            }
            default:
                break;
        }
        //pickerView.toolBarPositionBottom = YES; //默认为`NO`,`返回`和`确定`按钮显示在顶部，当设为`YES`,`返回`和`确定`按钮显示在底部
        //pickerView.topTipBarTitles = @[@"开始日期", @"结束日期"]; //不为`nil`时,`toolBarPositionBottom`会自动设置为`YES`，底部显示`返回`和`确定`按钮，顶部显示`开始日期 - 结束日期`
        //pickerView.topTipBarH = 50; //`topTipBarTitles`一栏高度，默认是44
        //pickerView.toolBarH = 30; //`返回`和`确定`按钮一栏高度，默认是44
        //pickerView.backgroundColor = [UIColor lightGrayColor];
        pickerView.doneButtonDidClickBlock = ^(MXPickerViewMode pickerViewMode, CGFloat countDownDuration, NSDate *date, id selectedTitleOrCustomModels) {
            NSLog(@"date: %@", date);
        };
    }];

MXPickerView 是一个 对 UIPickerView 和 UIDatePicker的封装, 三行代码实现`年月日`的弹出控件